The portion of the medulla spinalis which lies between the posterolateral sulcus

Posterolateral sulcus

Posterolateral sulcus can refer to:* Postero-lateral sulcus of medulla oblongata*Posterolateral sulcus of spinal cord...

 and the posterior median sulcus

Posterior median sulcus

The posterior median sulcus is very shallow; from it a septum of neuroglia reaches rather more than half-way into the substance of the medulla spinalis; this septum varies in depth from 4 to 6 mm., but diminishes considerably in the lower part of the medulla spinalis....

 is named the posterior funiculus. This area includes the dorsal columns (also called the posterior columns) which contains the fasciculus gracilis

Fasciculus gracilis

The fasciculus gracilis is a bundle of axon fibres in the posterior column of the spinal cord and carries information from the middle thoracic and lower limbs of the body...

 and, higher in the body, the fasciculus cuneatus

Fasciculus cuneatus

The fasciculus cuneatus is a tract of nerves in the spinal cord which primarily transmits information from the arms...

, which are separated by a partition of glial cells. Histologically, these two fasciculi are on other sides of the dorsal intermediate sulcus.